12 x 24 x 6mm Phenolic Radial Ball Bearing : 6901TH

0.25 x 0.625 x 0.196 inch Extra Low Noise P6 BearingR4ZZ Shielded Bearing 1/4 x 5/8 x 0.196 inch Miniature Ball Bearing

10 x 15 x 4mm Bearing : 6700ZZ

10 x 19 x 5 Radial Bearing : 6800ZZ

10 x 19 x 7 Radial Bearing : 6800ZZW7

10 x 22 x 6mm Radial Bearing : 6900ZZ

12 x 21 x 5 Radial Bearing : 6801ZZ

12 x 24 x 6 Shielded BearingNote this is a single bearing photo is for referance only

12x21x5 Bearing